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Like flatback-frannie asserted, the practice started when warrior horsemen carried swords. Since most people are right-handed, the swords were worn on the left side and thus thy mounted their horses on the right so that they could swing over their right leg easier, and safer for the horse. Practice became habit, then custom. Now swordless, we are taught to mount on the left and if we tried to do otherwise, it would feel very awkward.
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